as others have said, it's totally down to you - i almost never wear anything smarter than jeans and t-shirts at cons but some people do get dressed up, or even wear fancy dress...

i'm getting so excited about this weekend! i'm arriving lunchtime on friday and i REALLY hope the checking-in process goes quicker than last year... also, if you're staying at the hotel where the con is and you're getting breakfast - make sure you check the times on the tickets they give you, last year my sister and i got crappy times that were the same as events so we couldn't actually get any breakfast!

have fun in sweden & hopefully see you at some point this weekend!